chore: change ghostadapter to ghostobject

[NoelStephensUnity]

Purpose of this PR

Changing GhostAdapter to GhostObject

Jira ticket

Link to related jira ticket (Use the smart commits). Short version (e.g. MTT-123) also works and gets auto-linked

Changelog

• Added: The package whose Changelog should be added to should be in the header. Delete the changelog section entirely if it's not needed.
• Fixed: If you update multiple packages, create a new section with a new header for the other package.
• Removed/Deprecated/Changed: Each bullet should be prefixed with Added, Fixed, Removed, Deprecated, or Changed to indicate where the entry should go.

Documentation

• No documentation changes or additions were necessary.
• Includes documentation for previously-undocumented public API entry points.
• Includes edits to existing public API documentation.

Testing & QA (How your changes can be verified during release Playtest)

Functional Testing

Manual testing :

• Manual testing done

Automated tests:

• Covered by existing automated tests
• Covered by new automated tests

Does the change require QA team to:

• Review automated tests?
• Execute manual tests?
• Provide feedback about the PR?

If any boxes above are checked the QA team will be automatically added as a PR reviewer.

Up-port

N/A

Backports

N/A

[codecov-github-com]

Codecov Report

All modified and coverable lines are covered by tests ✅

@@                Coverage Diff                @@
##           develop-3.x.x    #4105      +/-   ##
=================================================
+ Coverage          70.44%   70.47%   +0.03%     
=================================================
  Files                146      146              
  Lines              23275    23276       +1     
=================================================
+ Hits               16396    16404       +8     
+ Misses              6879     6872       -7     

Flag	Coverage Δ
NGOv2_ubuntu_6000.3	70.47% <100.00%> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...de.gameobjects/Runtime/Connection/NetworkClient.cs	87.50% <100.00%> (+0.26%)	⬆️
....netcode.gameobjects/Runtime/Core/NetworkObject.cs	64.04% <ø> (ø)
...ts/Runtime/Messaging/Messages/ParentSyncMessage.cs	93.47% <ø> (ø)
...cts/Runtime/SceneManagement/NetworkSceneManager.cs	31.07% <ø> (+0.32%)	⬆️

... and 4 files with indirect coverage changes

Components	Coverage Δ
com.unity.netcode.gameobjects	70.47% <100.00%> (+0.03%)	⬆️

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